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Field Studies of a Clay-Enriched Horizon in the Lowest Part of the Solum of Some Brunizem and Gray-Brown Podzolic Soils in Illinois¹

ABSTRACT

The morphology, range in expression, and occurrence are described of a clay-enriched layer (Beta horizon) found below the B₂ horizon of selected soils in the area of Wisconsin glaciation in northern Illinois. The Beta horizon, characterized by a darker color and an abrupt, irregular lower boundary, was more pronounced in coarser textured drift, in Gray-Brown Podzolic soils, and in well-drained members of soil catenas.

¹ Contribution from the Department of Agronomy, Illinois Agr. Exp. Sta., Urbana, and Soil Conservation Service, USDA. This work was submitted by the senior author as part of a thesis in partial fulfillment of the requirements for the Ph.D. degree in the Graduate College, University of Illinois. Presented before Div. V. Soil Science Society of America, Lafayette, Ind., Aug. 4, 1958.

² Soil Scientist, Soil Conservation Service, Urbana, Illinois, and Professor of Soil Physics, Department of Agronomy, University of Illinois, respectively.

Received for publication November 30, 1959. Accepted for publication March 18, 1960.